Malicious PDF — malware analysis report

Static analysis result for SHA-256 163c1e7af74f1799…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 13:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18adcd3cff2a528ec647b967aa8ff251 SHA-1: bfd2d4ca658e9e8caa88c99f43f8493e4e071fbf SHA-256: 163c1e7af74f1799523d6c20138d29403b1ad98168305c7d710516f96ea71388
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or scam lure. The presence of external URIs and the overall detection pattern point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://maychamsocda.vn/images/userfiles/file/25877700229.pdf In PDF document text
    • http://capitaloffice.pl/fotki/file/94599187725.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fawipepogekufikoworogale.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/27348859607.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lojitiweziruja.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1540d237---sugepuzugewisazatobi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/11627904627.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/14365516972.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109121046047436.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/voxitut.pdfIn PDF document text
    • https://steammining.com/userfiles/file/69048250985.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/82325541742.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/18485493506.pdfIn PDF document text
    • https://citronel.com/userfiles/files/11680172892.pdfIn PDF document text
    • http://artospace.com/pics/file/zibomibuv.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210905034958.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/begux.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/99297570192.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/vaxetuvugesowumuxut.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912024834.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/92305452729.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/70172310029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=drift+max+pro+hack+mod+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10864 bytes
SHA-256: 03aae6267d6e41201b339bee682f236e1b6577c48bf14867ec9fb046f8a58cdf
font_02_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 21648 bytes
SHA-256: 188a3867dd365db6d0138fad2e30f4c395a91facb688a96cb3cb14eda6a44889

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